Information processing method

ABSTRACT

An information processing apparatus, an information processing method and a computer-readable medium for use with a virtual reality environment are provided. The information processing apparatus includes a sensing-area setting means for setting an area used to sense information on objects, and a transmission-area setting means for setting an area used for transmitting information on an object. The transmission area may be set wider than the sensing area. Thus, according to the present invention, information on an object can be reported to another object located at a remote position with a higher degree of reliability.

CROSS REFERENCE TO RELATED APPLICATIONS

The present application is a continuation of U.S. patent applicationSer. No. 09/389,803, filed on Sep. 3, 1999, the disclosure of which isherein incorporated by reference.

BACKGROUND OF THE INVENTION

In general, the present invention relates to an information processingapparatus, an information processing method and a presentation medium.More particularly, the present invention relates to an informationprocessing apparatus, an information processing method and apresentation medium which allow information on an application object(abbreviated hereafter to an AO) in a 3-dimensional virtual space to bereported to an avatar.

In a 3-dimensional virtual space on the Internet, a plurality of objectsare provided with information on a position and a “Dive” system is knownas a system which allows the objects to share the information onposition. Details of the “Dive” system are described in a referenceentitled “DIVE—A Platform for Multi-user Virtual Environments” authoredby C. Carlsson and O. Hagsand, 18(6) Computers and Graphics, pages633-669 (1993).

In the “Dive” system, however, the information is shared among allobjects existing in the world, so that as the number of objects rises,there is raised a problem of an increased number of messages (anincreased amount of information) exchanged among the objects.

In order to solve this problem, an area referred to as an aura isdefined for each object. An aura is a spatial area perceivable by anobject defined for each object in which the object is capable of sensingother objects. Since only objects placed in the same area shareinformation, the amount of information shared by objects can besuppressed even if the number of objects existing in the worldincreases. Details of this aura technique are described in a referenceentitled “Virtual Society: Extending the WWW to Support a Multi-userInteractive Shared 3D Environment” authored by Yasuaki Honda et al.,Proceedings of VRML '95, pages 109 to 116 (ACM Press 1995). Details ofthe aura concept are described in a reference entitled “A Spatial Modelof Interaction in Large Virtual Environments” authored by S. Benford andL. Fahlen in September 1993, in proceedings of G. DeMichelis et al.(Eds.) presented to a Third European Conference on Computer SupportedCooperative Work, pages 109 to 124 (Kluwer Academic Publishers).

By the way, an AO (application object) also exists in a 3-dimensionalvirtual space. An AO is a program having a variety of additionalfunctions in the 3-dimensional virtual space. The program is executed onan AO server.

In the technique utilizing the aura as described above, however, whenacertain object (including an avatar) wants to sense an AO, such as aclock tower which is far away from the object, there is raised a problemthat the object is not capable of sensing the AO if the AO is locatedoutside the aura of the object.

SUMMARY OF THE INVENTION

The present invention allows information of an AO in a 3-dimensionalvirtual space to be reported to an avatar. According to one aspect ofthe present invention, there is provided an information processingapparatus for management of information on objects placed in a3-dimensional virtual space, the information processing apparatusincluding: a sensing-area setting means for setting a sensing area usedfor a sensing object to sense information on one or more sensed objectswithin the sensing area; and a transmission-area setting means forsetting a transmission area used for a transmitting object to transmitinformation to one or more receiving objects within the transmissionarea.

According to another aspect of the present invention, there is providedan information processing method for management of information onobjects placed in a 3-dimensional virtual space, the informationprocessing method including the steps of: setting a sensing area usedfor a sensing object to sense information on one or more sensed objectswithin the sensing area; and setting a transmission area used for atransmitting object to transmit information to one or more receivingobjects within the transmission area.

According to a further aspect of the present invention, there isprovided a computer-readable medium for presenting a program executableby a computer to operate an information processing apparatus formanagement of information on objects placed in a 3-dimensional virtualspace, the program to carry out processing including the steps of:setting a sensing area used for a sensing object to sense information onone or more sensed objects within the sensing area; and setting atransmission area used for a transmitting object to transmit informationto one or more receiving objects within the transmission area.

According to the present invention, the transmission area may be setwider than the sensing area. This allows information on an object to bereported to another object located at a remote position with a higherdegree of reliability.

A better understanding of the features and advantages of the presentinvention will be obtained by reference to the following detaileddescription and accompanying drawings which set forth illustrativeembodiments in which the principles of the invention are utilized.

Additional features and advantages of the present invention aredescribed in, and will be apparent from, the following DetailedDescription of the Invention and the figures.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a block diagram showing a typical configuration of a systempresenting a shared virtual space to which the present invention isapplied;

FIG. 2 is a block diagram showing a typical configuration of a client PCemployed in the system shown in FIG. 1;

FIG. 3 is an explanatory diagram used for describing the operation ofthe system shown in FIG. 1;

FIG. 4 is an explanatory diagram used for describing the operation ofthe system shown in FIG. 1;

FIG. 5 is an explanatory diagram used for describing the operation ofthe system shown in FIG. 1;

FIG. 6 is an explanatory diagram used for describing an aura;

FIG. 7 is an explanatory diagram used for describing sensing of anobject accompanying a movement of an avatar;

FIG. 8 is an explanatory diagram used for describing mismatching insensing of avatars;

FIGS. 9A-9B are explanatory diagrams used for describing a transmissionaura and a reception aura of an AO;

FIG. 10 is an explanatory diagram used for describing managementinformation of objects held in a shared server employed in the systemshown in FIG. 1;

FIG. 11 shows a flowchart representing movement notification processing;

FIGS. 12A-12B show flowcharts representing departure detectionprocessing carried out at a step S1 of the flowchart shown in FIG. 11;and

FIGS. 13A-13B show flowcharts representing inclusion detectionprocessing carried out at a step S3 of the flowchart shown in FIG. 11.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 is a block diagram showing a typical configuration of a systempresenting a shared virtual space to which the present invention isapplied. It should be noted that the system cited in this specificationmeans an entity obtained as a result of logically putting a plurality ofapparatuses in a set without regard to whether or not the apparatusesare physically accommodated in a box.

As shown in FIG. 1, client PCs (personal computers) 1 to 3 are connectedto the Internet 7 through IPs (Internet connection service providers) 4to 6 respectively. In each of the client PCs 1 to 3, a VRML browser anda WWW browser are installed and ready to be operated.

The client PCs 1 to 3 each have two functions, namely, a 3D clientfunction and a 2D client function. The function for a 3D client is usedto notify a shared server 12 periodically or if necessary of data suchas information on the location of the client PC, to receive informationshared by other 3D objects from the shared server 12 supplied thereto,and to display the information. On the other hand, the function for a 2Dclient is executed to transmit a request for information to a WWW server10 in accordance with an HTTP, to receive a response to the request fromthe WWW server 10 and to display mainly 2-dimensional information. Whena URL is included in information received from the shared server 12, the3D-client issues a request for an access to the URL to the 2D-client. Atthis request, the 2D-client makes an access to the URL (in actuality tothe WWW server 10) to download data such as the shape of an object andforward the data to the 3D-client.

A LAN (Local Area Network) 9 is connected to the Internet 7 through arouter 8. Connected to the LAN 9 are the WWW server 10, a WLS (WorldLocation Server) 11, the shared server 12, AO (Application Object)servers 13 and 14, a mail server 15 and a communication server 16. TheWWW server 10 has hard discs (HDDs) 10 a and 10 b whereas the otherservers 11 to 16 have HDDs 11 a to 16 a, respectively.

It should be noted that the AO server 13 has a program for communicatingwith the shared server 12 to present for example an application object(AO) such as a robot or an electronic pet which moves autonomously in avirtual space. Much like the 3D-client function, the AO server 13communicates with the shared server 12 to report information on itselfand to receive information shared by other 3D objects.

The communication server 16 is connected to a telephone 18 or afacsimile 19 through a public telephone line network 17, and isradio-connected to a PHS (Personal Handyphone System) terminal 23through a PHS service provider 20 and to a pocket-bell terminal 24through a pager service provider 21.

FIG. 2 is a block diagram showing a typical configuration of hardware ofthe client PC 1. In this configuration, a CPU 30 carries out variouskinds of processing by executing a program stored in a ROM 34. A HDD 31is used for storing, among other information, VRML contents such asVRML2.0 files and predetermined script programs written in the Java (atrademark of Sun Microsystems, USA). A CD-ROM drive 32 reads out VRMLcontents stored in a CD-ROM disc 33.

Connected to a microphone 36 as well as right and left speakers 37 and38, a sound processing circuit 35 inputs a sound from the microphone 36or outputs sounds such as music and sound effects to the speakers 37 and38. A modem 39 (or other interface device) connected to the Internet 7is used for exchanging data with the Internet 7. An UO (input/output)interface 40 receives operation signals from a mouse 41 and a keyboard42. A graphics circuit 43 includes an embedded VRAM 44 for storingpicture data completing various kinds of processing. The graphicscircuit 43 reads out data from the VRAM 44, outputting the data to a CRTmonitor 45.

A WWW browser such as Netscape Navigator, a Java interpreter and theCommunity Place Browser are loaded into a RAM 46 to be executed by theCPU 30. Netscape Navigator is a WWW browser running under the Windows 95(a trademark of Microsoft Corp.) and the Community Place Browser is aVRML2.0 browser developed by Sony Corporation, the assignee of thepresent application.

The VRML 2.0 browser implements QvLib (which is a library [or a parser]for interpreting the VRML syntax developed and gratuitously released bySilicon Graphics, Inc.) and RenderWare (which is a software rendererdeveloped by Criterion Software Ltd., UK) or a parser and a rendererhaving capabilities equivalent to those of QvLib and RenderWarerespectively.

As shown in FIG. 1, the Community Place Browser exchanges various kindsof data with the Netscape Navigator serving as a WWW browser inaccordance with a NCAPI (Netscape Client Application ProgrammingInterface, a trademark). The Netscape Navigator browser receives an HTMLfile and VRML contents (including a VRML file and a script programwritten in the Java language) transmitted by the WWW server 10 by way ofthe Internet 7, storing the HTML file and the VRML contents in the localHDD 31. The Netscape Navigator browser processes the HTML file,displaying a text and a picture obtained as a result of the processingon a CRT monitor 45. On the other hand, the Community Place Browserprocesses the VRML file to display a 3-dimensional virtual space on theCRT monitor 45 and changes behaviors of objects in the 3-dimensionalvirtual space and other display states in accordance with a result ofexecution of the script program by the Java interpreter.

It should be noted that the other client PC 2 and PC 3 each have thesame configuration as the client PC 1 even though the configurations ofthe PC 2 and PC 3 are not shown explicitly in the figure. Next, theoperation of the embodiment described above is explained by referring toFIGS. 3 to 5. In the state shown in FIG. 3, first of all, a homepage ona web site providing VRML contents is browsed by using the WWW browseras shown by reference number A1. In this example, the homepage isaccessed at <http://pc.sony.cojp/sapari/>. Then, the user of the clientPC 1 or PC 2 downloads VRML contents including a VRML 2.0 file and ascript program written in the Java language to enable autonomous motionsin a VRML space as shown by reference number A2. It is needless to saythat VRML contents can also be obtained by letting the CD-ROM drive 32read out the contents from the CD-ROM disc 33.

Then, the Community Place Browser serving as a VRML 2.0 browser in theclient PC 1 or PC 2 interprets and executes the VRML 2.0 file downloadedand temporarily stored in the local HDD 31 as shown in FIG. 4 and, asindicated by reference number A3, an inquiry about the URL of the sharedserver 12 is transmitted to the WLS 11 in accordance with a VSCP(Virtual Society Server Client Protocol). Upon receiving the inquiry,the WLS 11 searches a shared server URL management table stored in theHDD 11 a for the URL inquired and transmits the URL of the shared sever12 to the client PC 1 or 2 in response to the inquiry as indicated byreference number A4. The URL thus found is used to connect the client PC1 and 2 to the shared server 12 as shown in FIG. 5. As a result, ashared message on attributes of a shared 3D object such as the positionand the motion thereof is transmitted by way of the shared server 12 asindicated by reference number AS and the shared message is forwarded toother client PC as indicated by reference number A6. In this way, amulti-user environment is implemented.

For a detailed description of the above connection procedure, refer toU.S. patent application Ser. No. 08/678,340. While the 3-dimensionalvirtual space is used under a multi-user environment in this case, the3-dimensional virtual space may be used under an environment other thana multi-user environment as well. That is to say, the 3-dimensionalvirtual space may be used under an environment which is referred tohereafter as a single-user environment for the sake of convenience. In asingle-user environment, the avatar of another user is not allowed toappear in the 3-dimensional virtual space and the avatar of the userherself/himself is not allowed to appear in the 3-dimensional virtualspace of the client PC of a user other than this particular userinitiating the pieces of processing indicated by reference numbers A1and A2. For the sake of convenience, the avatar of another user and theavatar of the particular user are referred to as a drawn avatar and apilot avatar respectively. In order to establish a single-userenvironment, it is not necessary to carry out the pieces of processingindicated by reference numbers A3 to A6.

Next, an aura is explained by referring to FIG. 6. As shown in thefigure, an aura 52 with a spherical shape having a predetermined radiusis formed around a pilot avatar 51 with the center of the spherecoinciding with pilot avatar 51. The pilot avatar 51 is capable ofreceiving information from another object located inside the aura 52.That is to say, the pilot avatar 51 is capable of visually recognizing adrawn avatar 53-1 and an application object (AO) 54-1 which are locatedinside the aura 52. To put it concretely, the pictures of the drawnavatar 53-1 and the object 54-1 are displayed on the CRT monitor of theclient PC of the pilot avatar 51. However, the pilot avatar 51 iscapable of visually recognizing neither a drawn avatar 53-2 nor anapplication object (AO) 54-2 which are located outside the aura 52. Toput it concretely, the pictures of the drawn avatar 53-2 and the object54-2 are not displayed on the CRT monitor of the client PC of the pilotavatar 51.

By the same token, an aura is also set for each of the other objects,namely, the drawn avatar 53-1 and the object 54-1, the drawn avatar 53-2and the object 54-2. In this system, the size of each aura is uniformfor all client PCs. It should be noted, however, that the aura of an AOcan be set with a size different from the aura of the avatar ifnecessary. Furthermore, the use of a spherical aura is merely forconvenience and an irregularly-shaped aura may be used if so desired.With the aura 52 prescribed as described above, it becomes necessary forthe pilot avatar 51 to acquire information from the drawn avatar 53-1and the object 54-1 but not from the drawn avatar 53-2 and the object54-2 which are located outside the aura 52. The amount of information tobe received can thus be reduced.

Consider an example shown in FIG. 7. When the avatar 51 moves,information on its new position is transmitted to the shared server 12.Upon receiving the information on the new position of the avatar 51, theshared server 12 identifies what objects (including avatars) are locatedinside the aura 52 centered at the new position of the avatar 51 andtransmits information on the objects to the client PC of the avatar 51.In the example shown in FIG. 7, since an object 54-1 is identified as anobject located inside the aura 52 centered at the new position of theavatar 51 after its movement, the shared server 12 transmits informationon the object 54-1 to the client PC of the avatar 51. Upon receiving theinformation on the object 54-1, the client PC of the avatar 51 displaysthe picture of the object 54-1, allowing the user of the avatar 51 tovisually recognize the object 54-1. If a large number of objects existin the world (the virtual space), there may also be many objects locatedinside the aura 52, increasing the amount of information to be received.In order to prevent the amount of information to be received fromexceeding what is really required, a maximum number of objects in anaura that can be visually recognized by the avatar of the aura is set inadvance to be controlled by the shared server 12. As a result, onlyinformation on a number of objects not exceeding the selected maximum istransmitted.

For example, assume that the maximum number of objects in the aura 52that can be visually recognized by the avatar 51 is set at two and thereare three or more objects located inside the aura 52. In this case, onlytwo objects that are included first or at earliest times are taken intoaccount. That is to say, information on the third and subsequent objectsentered the aura 52 after the second one are not reported to the avatar51. The maximum number of objects in the aura 52 that can be visuallyrecognized by the avatar 51 is set in advance at a value predeterminedby, among other limiting factors, a restriction on resources in theclient PC for the avatar 51 and a limit on a transmission bandwidth of anetwork between the client PC and the shared server 12. It should benoted, however, that the maximum number of objects in the aura 52 thatcan be visually recognized by the avatar 51 may exclude AOs (applicationobjects) moving autonomously in the world. Thus, the avatar 51 is alwayscapable of visually recognizing such an AO, even if the number ofobjects included in the aura 52 has already reached the maximum.

By the way, if a maximum limit value is imposed on the number of objectsin an aura that can be visually recognized by the avatar of the aura asdescribed above, it will be quite within the bounds of possibility thatimposition of such a limit results in a state of mismatching, that is astate in which the avatar of the aura is not capable of visuallyrecognizing another avatar in spite of the fact that the other avatar iscapable of visually recognizing the avatar of the aura. The state ofmismatching cited above is exemplified by the following case. Assumethat an avatar 51 enters an aura 62 of an avatar 61 after avatars 63 and64 have already been included in the aura 62 as shown in FIG. 8. In thiscase, the avatar 51 visually recognizes the avatar 61 due to the factthat the avatar 61 is the only avatar in an aura 52 of the avatar 51. Onthe other hand, the avatar 61 is not capable of visually recognizing theavatar 51 due to the fact that, when the avatar 51 enters the aura 62,the maximum number of avatars that can be recognized by the avatar 61 inthe aura 62 has been reached by the existence of the two other avatars63 and 64 in the aura 62. Thus, when the third avatar 51 newly entersthe aura 62, the avatar count exceeds the maximum number 2, making theavatar 61 incapable of visually recognizing the third avatar 51. As aresult, the avatar 61 is not capable of visually recognizing the otheravatar 51, in spite of the fact that the other avatar 51 is capable ofvisually recognizing the avatar 61. Thus, for example, the avatar 51 iscapable of requesting the avatar 61 to have a chat with the avatar 61,but the avatar 61 is not capable of accepting the request for the chatmade by the avatar 51.

In order to avoid such a state of mismatching, the system is designed,so that, if the avatar 51 is capable of visually recognizing the avatar61, the avatar 61 is also made capable of visually recognizing the newlyentering avatar 51, even in a state in which the presence of the avatar51 causes the avatar count in the aura 62 to exceed the maximum valuethereof. It is thus possible to avoid a state of mismatching in which aspecific avatar in an aura is not capable of visually recognizinganother avatar in the aura in spite of the fact that the other avatar iscapable of visually recognizing the specific avatar. So far, a receptionaura of an avatar has been mainly explained. Next, a transmission auraof an AO provided by the present invention is described by referring toFIG. 9A. In this system, while only a reception aura is set for anavatar, reception and transmission auras are set for an AO. As shown inFIG. 9A, a reception aura 83 and a transmission aura 84 having a radiuslarger than that of the reception aura 83 are set for an AO 81. Thetransmission aura 84 is capable of informing an avatar existing at afarther location of information on the AO 81. (Note that transmissionmay also occur within the reception aura 83.) A reception aura 85 of anavatar 82 has a radius equal to the reception aura 83. If desired, thereception aura 85 may have a radius different from that of the receptionaura 83. Without setting the transmission aura 84, that is, with onlythe reception aura 83 set for the AO 81, the avatar 82 will not becapable of sensing the AO 81, which is a clock tower in this example,since the AO 81 is located outside the reception aura 85 of the avatar82. By setting also the transmission aura 84 having a radius greaterthan that of the reception aura 83, however, it is more positivelywithin the bounds of possibility that the avatar 82 is located insidethe transmission aura 84, even if the avatar 82 is far away from the AO81, so that the avatar 82 is capable of sensing the AO 81.

FIG. 9B shows details similar to that of FIG. 9A, with the receptionaura 83 b wider than the transmission aura 84 b. Such a configuration isuseful when the AO 81 b is desired to receive information from theavatar 82 from a greater distance than the AO 81 b is desired totransmit information. As an example, the AO 81 b may be a VR policestation that is able to receive information from avatars at a widedistance throughout the VR world.

FIG. 11 shows a flowchart representing movement notification processingwhich is carried out by the shared server 12 when the shared server 12is informed of a movement of the avatar 82 in the virtual space shown inFIG. 9A. (Similar steps are undertaken with regard to the virtual spaceshown in FIG. 9B.) It should be noted that the shared server 12 hasinformation listed in a table shown in FIG. 10 for each object Z, namelya shared object management table. In the shared object management tableshown in FIG. 10, a list (set) A is a set of other objects aware of theobject Z. A list (set) B is a set of other objects known by the objectZ. A transmission-aura validity flag indicates whether the transmissionaura of the object Z is valid or invalid. As shown in FIG. 11, theflowchart begins with a step S1 in which the shared server 12 carriesout departure detection processing when the avatar 82 moves. In theprocessing, the shared server 12 forms a judgment as to whether or notanother object such as the AO 81 is no longer sensed by the avatar 82,that is, whether or not the other object is no longer included in thereception aura 85 of the avatar 82 due to the movement of the avatar 82.In the processing, the shared server 12 also forms a judgment as towhether or not the movement of the avatar 82 causes the avatar 82 todepart from the auras of other objects including the AO 81. The flow ofthe processing then goes on to a step S2 in which the shared server 12transmits a message on the movement of the avatar 82 to other objects inthe world. This message may include information on the AO 81 to other VRobjects within the transmission aura 84. The message may also includeinformation to the avatar 82 on other VR objects within the receptionaura 85.

The flow of the processing then goes on to a step S3 in which the sharedserver 12 carries out inclusion detection processing. In the processing,the shared server 12 forms a judgment as to whether or not anotherobject gets newly included in the reception aura 85 of the avatar 82 dueto the movement of the avatar 82. In the processing, the shared server12 also forms a judgment as to whether or not the avatar 82 enters theauras of other objects such as the AO 81 due to the movement of theavatar 82. The formation of the judgment at the step S1 is explained byreferring to flowcharts shown in FIGS. 12A-12B as follows. As shown inFIG. 12A, the flowchart begins with a step S11 in which the sharedserver 12 selects an object from those in the set B of the avatar 82 asan object X. The flow of the processing then goes on to a step S12 inwhich the shared server 12 forms a judgment as to whether or not allobjects in the set B of the avatar 82 have completed the subsequentprocessing following step S12 If the outcome of the judgment formed atthe step S12 indicates that all objects in the set B of the avatar 82have not yet completed the subsequent processing, the flow of theprocessing goes on to a step S13.

At the step S13, the shared server 12 forms a judgment as to whether thetransmission-aura area of the object X is valid or invalid. If theoutcome of the judgment formed at the step S13 indicates that thetransmission-aura area of the object X is invalid, the flow of theprocessing goes on to a step S14. At the step S14, the shared server 12forms a judgment as to whether or not the object X is still included inthe reception-aura area of the avatar 82 after the movement of theavatar 82. If the outcome of the judgment formed at the step S14indicates that the object X is no longer included in the reception-auraarea of the avatar 82, the flow of the processing goes on to a step S15.At the step S15, the shared server 12 deletes the object X from the setB of the avatar 82 and deletes the avatar 82 from the set A of theobject X since the object X is no longer in the reception-aura area ofthe avatar 82. That is to say, the shared sever 12 updates the sharedobject management tables (see FIG. 10) of the avatar 82 and the objectX. After the shared object management tables have been updated at thestep S15, the flow of the processing goes back to the step S11 to repeatthe processing described so far. It should be noted that, if the outcomeof the judgment formed at the step S14 indicates that the object X isstill included in the reception-aura area of the avatar 82, on the otherhand, it is not necessary to delete the object X from the set B of theavatar 82 nor the avatar 82 from the set A of the object X. In thiscase, the flow of the processing goes back to the step S11, skipping theprocessing of the step S115.

If the outcome of the judgment formed at the step S13 indicates that thetransmission-aura area of the object X is valid, on the other hand, theflow of the processing goes on to a step S16. At the step S16, theshared server 12 forms a judgment as to whether or not the avatar 82 isstill included in the transmission-aura area of the object X after themovement of the avatar 82. If the outcome of the judgment formed at thestep S16 indicates that the avatar 82 is no longer included in thetransmission-aura area of the object X, the flow of the processing goeson to the step S15 in which the shared sever 12 updates the sharedobject management tables as described above. After the shared objectmanagement tables have been updated at the step S15, the flow of theprocessing goes back to the step S11 to repeat the processing describedso far. It should be noted that, if the outcome of the judgment formedat the step S16 indicates that the avatar 82 is still included in thetransmission-aura area of the object X, on the other hand, it is notnecessary to update the shared object management tables. In this case,the flow of the processing goes back to the step S111, skipping theprocessing of the step S115.

Thereafter, the pieces of processing of the steps S11 to S16 are carriedout repeatedly as long as the outcome of the judgment formed at the stepS12 indicates that all the objects in the set B of the avatar 82 havenot yet been selected. When all objects in the set B of the avatar 82have been selected, the flow of the processing goes on to a step S17. Atthe step S17, the shared server 12 selects an object from those in theset A of the avatar 82 as an object X. The flow of the processing thengoes on to a step S18.

At the step S18, the shared server 12 forms a judgment as to whether ornot all objects in the set A of the avatar 82 have completed theprocessing steps following step S18. If the outcome of the judgmentformed at the step S18 indicates that all objects in the set A of theavatar 82 have not yet completed the subsequent processing, the flow ofthe processing goes on to a step S19.

At the step S19, the shared server 12 forms a judgment as to whether thetransmission-aura area of the avatar 82 is valid or invalid. If theoutcome of the judgment formed at the step S19 indicates that thetransmission-aura area of the object X is invalid, the flow of theprocessing goes on to a step S20.

At the step S20, the shared server 12 forms a judgment as to whether ornot the avatar 82 is still included in the reception-aura area of theobject X after the movement of the avatar 82. If the outcome of thejudgment formed at the step S20 indicates that the avatar 82 is nolonger included in the reception-aura area of the object X, the flow ofthe processing goes on to a step S21.

At the step S21, the shared server 12 deletes the avatar 82 from the setB of the object X and deletes the object X from the set A of the avatar82 since the avatar 82 is no longer in the reception-aura area of theobject X. That is to say, the shared sever 12 updates the shared objectmanagement tables (see FIG. 10) for the object X and the avatar 82.After the shared object management tables have been updated at the stepS21, the flow of the processing goes back to the step S17 to repeat theprocessing described so far.

It should be noted that, if the outcome of the judgment formed at thestep S20 indicates that the avatar 82 is still included in thereception-aura area of the object X, on the other hand, it is notnecessary to delete the avatar 82 from the set B of the object X anddelete the object X from the set A of the avatar 82. In this case, theflow of the processing goes back to the step S117, skipping theprocessing of the step S21.

If the outcome of the judgment formed at the step S19 indicates that thetransmission-aura area of the avatar 82 is valid, on the other hand, theflow of the processing goes on to a step S22. At the step S22, theshared server 12 forms a judgment as to whether or not the object X isstill included in the transmission-aura area of the avatar 82 after themovement of the avatar 82. If the outcome of the judgment formed at thestep S22 indicates that the object X is not included in thetransmission-aura area of the avatar 82 anymore, the flow of theprocessing goes on to the step S21 in which the shared sever 12 updatesthe shared object management tables as described above. After the sharedobject management tables have been updated at the step S21, the flow ofthe processing goes back to the step S17 to repeat the processingdescribed so far. It should be noted that, if the outcome of thejudgment formed at the step S22 indicates that the object X is stillincluded in the transmission-aura area of the avatar 82, on the otherhand, it is not necessary to update the shared object management tables.In this case, the flow of the processing goes back to the step S17,skipping the processing of the step S21.

Thereafter, the pieces of processing of the steps S17 to S22 are carriedout repeatedly as long as the outcome of the judgment formed at the stepS18 indicates that objects in the set A of the avatar 82 have not yetall completed the subsequent processing. When all objects in the set Aof the avatar 82 have completed the subsequent processing, the flow ofdeparture detection processing is terminated and the flow of processinggoes back to the step S2 of the flowchart shown in FIG. 11.

Next, the inclusion detection processing is explained by referring toflowcharts shown in FIGS. 13A-13B as follows.

As shown in FIG. 13A, the flowchart begins with a step S31 in which theshared server 12 selects an object from those in the shared objectmanagement table as an object X. The flow of the processing then goes onto a step S32.

At the step S32, the shared server 12 forms a judgment as to whether ornot all objects in the shared object management table have completed thesubsequent processing. If all objects in the shared object managementtable have not yet completed the subsequent processing, the flow of theprocessing then goes on to a step S33.

At the step S33, the shared server 12 forms a judgment as to whether ornot the object X is the avatar 82 itself. If the object X is the avatar82 itself, the flow of the processing goes back to the step S31. If theobject X is not the avatar 82 itself, on the other hand, the flow of theprocessing goes on to a step S34. At the step S34, the shared server 12forms a judgment as to whether the transmission-aura area of the objectX is valid or invalid. If the outcome of the judgment formed at the stepS34 indicates that the transmission-aura area of the object X isinvalid, the flow of the processing goes on to a step S35. At the stepS35, the shared server 12 finds out if information in the shared objectmanagement table indicates that the avatar 82 is not aware of the objectX and forms a judgment as to whether or not the object X is actuallylocated in the reception-aura area of the avatar 82 after the movementof the avatar 82. If the information in the shared object managementtable shows that the avatar 82 is not aware of the object X but theoutcome of the judgment formed at the step S35 indicates that the objectX was included in the reception-aura area of the avatar 82 after themovement of the avatar 82, the flow of the processing goes on to a stepS37.

At the step S37, the shared server 12 adds the object X to the set B ofthe avatar 82 and adds the avatar 82 to the set A of the object X in theshared object management tables since the object X is now included inthe reception-aura area of the avatar 82 due to the movement of theavatar 82. The flow of the processing then goes on to a step S38.

If the information in the shared object management table shows that theavatar 82 is aware of the object X or the outcome of the judgment formedat the step S35 indicates that the object X is not included in thereception-aura area of the avatar 82 after the movement of the avatar82, on the other hand, the flow of the processing goes on to the stepS38, skipping the processing of the step S37 since updating is notrequired. The flow of the processing from the step S35 to the step S38skipping the step S37 may represent a case in which the object X hasbeen excluded from the reception-aura area of the avatar 82 due to themovement of the avatar 82.

If the outcome of the judgment formed at the step S34 indicates that thetransmission-aura area of the object X is valid, on the other hand, theflow of the processing goes on to a step S36.

At the step S36, the shared server 12 finds out if information in theshared object management table indicates that the avatar 82 is not awareof the object X and forms a judgment as to whether or not the avatar 82has entered the transmission-aura area of the object X after themovement of the avatar 82. If the information in the shared objectmanagement table shows that the avatar 82 is not aware of the object X,but the outcome of the judgment formed at the step S35 indicates thatthe avatar 82 has entered the transmission-aura area of the object Xafter the movement of the avatar 82, the flow of the processing goes onto the step S37 to update the shared object management table asdescribed above. If the information in the shared object managementtable shows that the avatar 82 is aware of the object X or the outcomeof the judgment formed at the step S36 indicates that the avatar 82 isnot in the transmission-aura area of the object X after the movement ofthe avatar 82, on the other hand, the flow of the processing goes on tothe step S38, skipping the processing of the step S37 since updating isnot required. The flow of the processing from the step S36 to the stepS38 skipping the step S37 may represent a case in which the avatar 82has departed from the transmission-aura area of the object X due to themovement of the avatar 82.

At the step S38, the shared server 12 forms a judgment as to whether thetransmission-aura area of the avatar 82 is valid or invalid. If theoutcome of the judgment formed at the step S38 indicates that thetransmission-aura area of the avatar 82 is invalid, the flow of theprocessing goes on to a step S39.

At the step S39, the shared server 12 finds out if information in theshared object management table indicates that the object X is not awareof the avatar 82 and forms a judgment as to whether or not the avatar 82has actually entered the reception-aura area of the object X after themovement of the object X. If the information in the shared objectmanagement table shows that the object X is not aware of the avatar 82but the outcome of the judgment formed at the step S35 indicates thatthe avatar 82 has entered the reception-aura area of the object X afterthe movement of the object X, the flow of the processing goes on to astep S41.

At the step S41, the shared server 12 adds the avatar 82 to the set B ofthe object X and adds the object X to the set A of the avatar 82 in theshared object management tables since the avatar 82 is now included inthe reception-aura area of the object X due to the movement of theavatar 82. The flow of the processing then goes back to the step S31.

If the information in the shared object management table shows that theobject X is aware of the avatar 82 or the outcome of the judgment formedat the step S39 indicates that the avatar 82 is not included in thereception-aura area of the object X after the movement of the avatar 82,on the other hand, the flow of the processing goes back to the step S31,skipping the processing of the step S41 since updating is not required.The flow of the processing from the step S39 back to the step S31skipping the step S41 may represent a case in which the avatar 82 hasdeparted from the reception-aura area of the object X due to themovement of the avatar 82.

If the outcome of the judgment formed at the step S38 indicates that thetransmission-aura area of the avatar 82 is valid, on the other hand, theflow of the processing goes on to a step S40.

At the step S40, the shared server 12 finds out if information in theshared object management table indicates that the object X is not awareof the avatar 82 and forms a judgment as to whether or not the object Xis actually located in the transmission-aura area of the avatar 82 afterthe movement of the avatar 82. If the information in the shared objectmanagement table shows that the object X is not aware of the avatar 82but the outcome of the judgment formed at the step S40 indicates thatthe object X has entered the transmission-aura area of the avatar 82after the movement of the avatar 82, the flow of the processing goes onto the step S41 to update the shared object management table asdescribed above. If the information in the shared object managementtable shows that the object X is aware of the avatar 82 or the outcomeof the judgment formed at the step S40 indicates that the object X isnot in the transmission-aura area of the avatar 82 after the movement ofthe avatar 82, on the other hand, the flow of the processing goes backto the step S31, skipping the processing of the step S41 since updatingis not required. The flow of the processing from the step S40 back tothe step S31 skipping the step S41 may represent a case in which theobject X has been excluded from the transmission-aura area of the avatar82 due to the movement of the avatar 82.

The pieces of processing in the steps S31 to S41 are carried outrepeatedly as long as the outcome of the judgment formed at the step S32indicates that all the objects in the shared object management tablehave not yet completed the subsequent processing. When all objects inthe shared object management table have completed the subsequentprocessing, the flow of the processing is terminated and goes back tothe calling program.

It should be noted that a computer program to be executed for carryingout the various kinds of processing described above may be presented tothe user in computer-readable form through presentation media which canbe network presentation media such as a network, or informationrecording media such as a CD-R, a CD-ROM or a floppy disc. As analternative, the program can be stored in an embedded RAM or a hard discif necessary.

It should be understood that various changes and modifications to thepresently preferred embodiments described herein will be apparent tothose skilled in the art. Such changes and modifications can be madewithout departing from the spirit and scope of the present invention andwithout diminishing its intended advantages. It is therefore intendedthat such changes and modifications be covered by the appended claims.

1. An information processing method for management of information onobjects placed in a 3-dimensional virtual space, the method comprising:configuring a storage element to store information related to a sensingobject, information related to one or more sensed objects, informationrelated to a sensing area, information related to a transmitting object,information related to one or more receiving objects, and informationrelated to a transmission area, wherein said sensing area is used forsaid sensing object to sense said information related to said one ormore sensed objects within said sensing area, wherein said transmissionarea is used for said transmitting object to transmit said informationrelated to said transmitting object to said one or more receivingobjects within said transmission area, and wherein at least one of saidsensing object and transmitting object is associated with a server; andconfiguring a processor coupled to said storage element to selectivelyset said sensing area and said transmission area, wherein said processoris further configured to determine whether said one or more sensedobjects are within said sensing area, and to determine whether said oneor more receiving objects are within said transmission area.